Use these options to specify how the date range returns results. "Exact" means that the start and end dates of descriptions returned must fall entirely within the date range entered. "Overlapping" means that any description whose start or end dates touch or overlap the target date range will be returned.

The fonds consists primarily of letters written during World War I to Drake's sister Daisy Molson and sister's husband, John Dunham Molson. Letters are accompanied by transcriptions and biographical material prepared by Martha E. McKenna...